Oil - yielding organic matter is contained in the shales.在这些页岩里有产油的有机物质.Thus clays and shales tend to be impermeable.因此粘土和页岩就往往不透水.Sandstones are, as a rule , interbedded with shales.砂岩通常都与页岩互层.Alternating sandstones and...
Why are you lurking around outside my house?你在我房子外面鬼鬼祟祟的，想干什么？There is a suspicious man lurking in the shadows.有一可疑的人躲在阴暗中.A tiger was lurking in the jungle outside the village.一只老虎埋伏在村外的丛林中....
A little porcupine made a house by the side of the river.小刺猬在小河边上造了一幢小房子.It is the Kookaburra ( Porcupine ) and Skunk Kingdoms that greet you today.今天是笑翠鸟 ( 豪猪 ) 和臭鼬王国向你们问候.One of the sharp hollow spines of a porcupine o...